Nikon V3 - Manual (Page 241)

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3 Recompose the photograph and shoot.
Focus will remain locked between
shots.
Do not change the distance between the camera and the sub-
ject while focus lock is in effect. If the subject moves, focus again
at the new distance.
Reduce flicker and banding in the display and in movies while
shooting under fluorescent or mercury-vapor lighting. Choose a
frequency which matches that of the local AC power supply.
Flicker Reduction
A Flicker Reduction
If you are unsure as to the frequency of the local power supply, test
both options and choose the one that produces the best results. Flicker
reduction may not produce the desired results if the subject is very
bright, in which case you should select mode
v or w and choose a
smaller aperture (higher f-number).